Greetings Ello Ebonlocke, Mayor of Darkshire. I'm afraid I have news for your town. Grave news.
You see, I am a creator. I fooled the bearer of this note into aiding me in my latest, most dire creation - a fiend of flesh and bone and twisted metal! As you read this, it's likely outside my humble dwelling, gnashing its teeth and waiting for my word to go forth and slaughter.
But you'll know soon enough.